FQT Using variables in text and text equations: Difference between revisions
| (3 intermediate revisions by the same user not shown) | |||
| Line 1: | Line 1: | ||
[https://docs.moodle.org/33/en/Formulas_question_type < Formulas question type] | [https://docs.moodle.org/33/en/Formulas_question_type < Formulas question type] | ||
==Using variables in text== | ==Using variables in the text== | ||
It is | It is easy to insert values of variables directly in the text. All that is needed is to enclose the variable names with <span style="font-family:monospace;font-size:113%;">{ }</span>. Each text field has a scope of variables. All variables x of either number or string in the scope of the text can be used to replace the corresponding placeholder <span style="font-family:monospace;font-size:113%;">{x}</span> in the text. | ||
It is also possible to evaluate an expression directly in the text by adding an equal sign at the beginning of the bracket such as <span style="font-family:monospace;font-size:113%;">{=x/1000}</span>. | It is also possible to evaluate an expression and insert its value directly in the text by adding an equal sign at the beginning of the bracket such as <span style="font-family:monospace;font-size:113%;">{=x/1000}</span>. This way is simpler if the named variables are not required. However, no error check is done unless the question is being instantiated in the quiz. An example is the rescaling of meters to kilometers below: | ||
<pre style="font-size:113%;width: 98%;"> | <pre style="font-size:113%;width: 98%;"> | ||
| Line 13: | Line 13: | ||
==Using variables in text equations== | ==Using variables in text equations== | ||
Text equations are equations that are displayed in the text using | Text equations are mathematical expressions or equations that are displayed in the text using math syntax such as: | ||
*[http://www.tug.org/ TeX] | *[http://www.tug.org/ TeX] | ||
*[https://www.w3.org/TR/MathML3/ MathML] | *[https://www.w3.org/TR/MathML3/ MathML] | ||
*[http://asciimath.org/ AsciiMath] | *[http://asciimath.org/ AsciiMath] | ||
See [https://docs.moodle.org/32/en/Mathematics#Equation_Construction_and_Display Equation Construction and Display] for additional information on writing mathematical expressions. | |||
Values of variables can be inserted in text equations in the same way as in the text, that is, by enclosing the variable names with {}. Values of expressions such as {=x/1000} can also be inserted. | |||
<div style="border:1px solid #bce8f1;border-radius:4px;padding: 0px 15px 0px; margin:20px 0 25px;"> | <div style="border:1px solid #bce8f1;border-radius:4px;padding: 0px 15px 0px; margin:20px 0 25px;"> | ||
<div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div> | <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div> | ||
Write the following equation in | Write the following equation in TeX syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables: | ||
::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0 | ::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0 | ||
| Line 36: | Line 38: | ||
<div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div> | <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div> | ||
Write the following equation in | Write the following equation in MathML syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables: | ||
::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0 | ::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0 | ||
| Line 76: | Line 78: | ||
<div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div> | <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div> | ||
Write the following equation in the AsciiMath syntax, | Write the following equation in the AsciiMath syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables: | ||
::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0 | ::{a}''x''<sup>2</sup> + {b}''x'' + {c} = 0 | ||
| Line 89: | Line 91: | ||
<div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div> | <div style="font-family:Lucida Sans Unicode;font-size:113%;color:#6c336d;margin:10px 0 10px;> Example</div> | ||
Use variables and expressions in text equations that appear in the main question text, the general feedback and the part's feedback of a Formulas question. Use | Use variables and expressions in text equations that appear in the main question text, the general feedback and the part's feedback of a Formulas question. Use MathML syntax. | ||
''Downloadable question file:'' [https://drive.google.com/open?id=1MVUhvncCMHYl3LM-XpklggV-bpku5L8v QuadraticEquation.xml] | ''Downloadable question file:'' [https://drive.google.com/open?id=1MVUhvncCMHYl3LM-XpklggV-bpku5L8v QuadraticEquation.xml] | ||
Revision as of 03:10, 6 December 2017
Using variables in the text
It is easy to insert values of variables directly in the text. All that is needed is to enclose the variable names with { }. Each text field has a scope of variables. All variables x of either number or string in the scope of the text can be used to replace the corresponding placeholder {x} in the text.
It is also possible to evaluate an expression and insert its value directly in the text by adding an equal sign at the beginning of the bracket such as {=x/1000}. This way is simpler if the named variables are not required. However, no error check is done unless the question is being instantiated in the quiz. An example is the rescaling of meters to kilometers below:
What is the speed of the rocket if it travels with distance {=x/1000} km in {t} s?
Using variables in text equations
Text equations are mathematical expressions or equations that are displayed in the text using math syntax such as:
See Equation Construction and Display for additional information on writing mathematical expressions.
Values of variables can be inserted in text equations in the same way as in the text, that is, by enclosing the variable names with {}. Values of expressions such as {=x/1000} can also be inserted.
Write the following equation in TeX syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables:
- {a}x2 + {b}x + {c} = 0
\( {a} x^2 + {b} x + {c} = 0 \)
Write the following equation in MathML syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables:
- {a}x2 + {b}x + {c} = 0
«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»
«mn»{a}«/mn»
«msup»«mi»x«/mi»«mn»2«/mn»«/msup»
«mo»+«/mo»
«mn»{b}«/mn»
«mi»x«/mi»
«mo»+«/mo»
«mn»{c}«/mn»
«mo»=«/mo»
«mn»0«/mn»
«/math»
MathML equations are usually created with the aid of an editor. When creating the equation with an editor, it is easier to write a number, say 99, in lieu of the variables, for example:
«math xmlns=¨http://www.w3.org/1998/Math/MathML¨» «mn»99«/mn» «msup»«mi»x«/mi»«mn»2«/mn»«/msup» «mo»+«/mo» «mn»99«/mn» «mi»x«/mi» «mo»+«/mo» «mn»99«/mn» «mo»=«/mo» «mn»0«/mn» «/math»
and then replace the numbers 99 by the variables {a}, {b} and {c} in the HTML code.
Write the following equation in the AsciiMath syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables:
- {a}x2 + {b}x + {c} = 0
<script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=AM_HTMLorMML"></script>
`{a} x^2 + {b} x + {c} = 0`
Use variables and expressions in text equations that appear in the main question text, the general feedback and the part's feedback of a Formulas question. Use MathML syntax.
Downloadable question file: QuadraticEquation.xml
This Formulas question looks like this:
